Method of autonomously controlling shape memory alloy actuator, involves determining event such as change in slope without reaching valley based on analyzing derivative of electrical resistivity change signal of actuator

摘要

The method involves delivering an activation signal to a shape memory alloy (SMA) actuator (12) coupled to a load (14) by a power source (16). A controller (18) is coupled to the power source and actuator for monitoring an electrical resistivity of actuator at preset time. An event such as change in slope without reaching a valley or jump in resistance is determined based on analyzing derivative of electrical resistivity change signal of SMA actuator. A response signal is transmitted to analyze operation of actuator, when the event of actuator is determined.